So for returns a lazy-seq of the combinations and I am forcing it to
process the values by filtering.
mmm...
I still tried your approach and nothing changed in processing time.
I changed the for form to filter as it is pairing the combinations, I
didn't think it would make any difference since I just moved the
filtering to another position, but I still tried:

(defn all-pals [in]
  (let [len (count in)]
    (for [i (range 0 (dec (dec len))), j (range (inc i) len) :when
(palindrome? (subs in i j))]
      (do (subs in i j)))))

it didn't work with the long input.
So how can I filter without processing the values, quite a
contradiction.

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